
13. FUNCTIONS TO SIMPLIFY PROGRAMMING
13.1 Canned Cycles (G73, G74, G76, G78, G79, G80 to G89)
13.1.2 G74 (counter tapping cycle)
G74
Lj
0 Initial
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A point
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II
Point R
Bottom point
0 of the hole
OZ
P
Spindle
Dwell cw
At the bottom of the hole, the spindle rotates clockwise and left handed tapping
performed.
(Note)
During counter tapping specified in G74, the feed rate override is ignored and the cycle does not
stop until the end of the return operation, even if a feed hold is applied.
13.1.3
G76 (fine boring cycle)
G76
CJJ
Spindle CW
A
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Initial
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i point
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v
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0
; Point R
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0
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oss
@
Dwell
0
OSS Oriented Spindle stop
Since a spindle oriented stop is performed at the bottom of the hole and the spindle
retracts after shifting in the direction opposite to the cutter direction, high precision and
efficient boring is performed without scratching the workpiece surface.
l-55